近年来,从提高生产效率考虑,切削刀具材料已有从高速钢向超硬合金材料发展的趋势。但是,现在稀有金属价格上涨,成为超硬刀具成本提高的重要原因。另外,超硬合金钻头的韧性低于高速钢钻头,为防止崩刃,需要进行倒角珩磨处理。为此,切削阻力增大,刀 In recent years, from the perspective of improving production efficiency, cutting tool materials have been the trend from high-speed steel to cemented carbide materials. However, the price of rare metals is now rising, becoming an important reason for the increased cost of super-hard tools. In addition, the toughness of cemented carbide drill bit is lower than high-speed steel drill bit, in order to prevent chipping, the need for chamfer honing. To this end, cutting resistance increases, the knife